154 



TEREBRATULA cordiformis. 



TAB. CCCCXCY.— Jigs. 2 and 4. 



Spec. Char. Heart-shaped^, front much elevated 

 with a deep sinus in the margin ; sides rather 

 convex, sharp-edged ; middle ornamented with 

 several acute furrows reaching almost to the 

 beaks. 



1 HIS differs from the last in being much more tumid in 

 the middle, and in having- 3 or more sharp angular fur- 

 rows extending from the middle of the large marginal 

 sinus almost to the beaks : it is very variable in magni- 

 tude. 



Found in the Mountain Limestone of Ireland, but not 

 plentiful. 



TEREBRATULA reniformis. 



TAB. CCCCXCVL— /g^s. 1, 2, 3, and 4. 



Spec. Char. Reniform^ middle furnished with 

 three or four longitudinal rounded ridges, ter- 

 minated by acute plaits in the much elevated 

 margin of the front ; sides inflated below the 

 entire edges. 



A MUCH rounded, almost two-lobed, inflated and more 

 or less depressed shell. The form of the ridges and in- 

 termediate furrows is very remarkable, being rounded, 

 while the corresponding notches in the margin are acute- 

 angular : the peculiar form of the sides of the beaked 

 valve, which are inflated so as to hang below the edges, 

 will distinguish all the varieties of this species. 



Very abundant in the Mountain Limestone of Dublin 

 and Cork. 



